Patients who are planned to undergo surgical correction of symptomatic stress-incontinence are asked to participate in the study. Patients who have stage 2 or more genital prolapse (ICS classification) are excluded. Patients who undergo surgery for recurrence of stress-incontinence are excluded as are patients who undergo concomitant surgical procedures. Prior to surgery urodynamic investigation is performed in all patients.

Performed interventions in the first year after stress incontinence surgery

POWER / DATA ANALYSIS:

We consider the incontinence domain of the UDI to be the most important outcome measurement. If the differences in stress domain score would exceed 6 points we would conclude that either the TVT-O or TVT-S is not preferable even if beneficial effects with respect to morbidity would be observed.

Based on the variation in domain scores of the UDI, power calculation was based on a standard deviation of 12. With a power of 80% and an á level of 0.05, the calculated sample size necessary is 64 in each group.